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in Class XI Chemistry by (-2,838 points)
First member of each group of representative elements (i.e., s and p-block elements) shows anomalous behaviour. Illustrate with two examples.

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by (-1,017 points)
First member of each group of s- and p-block elements shows anomalous behaviour due to the following reasons:
(i) Small size
(ii) High ionization enthalpy
(iii) High electronegativity
(iv) Absence of d-orbitals
Examples: Li in the first group shows different properties from the rest of elements like covalent nature of its compounds, formation of nitrides.
Similarly, beryllium, the first element of second group differs from its own group in the following ways:
• Beryllium carbide reacts With water to produce methane gas while carbides of other elements give acetylene.
• Beryllium shows a coordination number of four while other elements show a coordination number of six.
by Basic (24 points)
Sorry niki i don't really get the four and   six confirmation number. Please explain maybe you meant four and two
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by Basic (24 points)
The anomalous behavior of the 1st member of each group in the periodic table is due to the following reasons:
  
1:The small size of the atomic
2:The high electronegativity
3: low ionization on the p_block element of the 1st member in each group due to interelectron repulsion of the impaired p_block element like the berylium.
4:nonavailabilty of d_orbitals in its valence shell.
5:large charge/radius ratio

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